Modeling and Analysis of CH HVAC by Rishel

By Rishel

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While boiling transitions from isolated bubbles to rapid boiling the refrigerant becomes more agitated, increasing the outer heat transfer coefficient. This explains why the refrigerant side heat transfer coefficient is tied to load. Refrigerant Side Tube wall Water Side hAinner=fn(Re) hAouter=fn(Load) Figure 20. Cross-section of a Single Tube in the Evaporator Tube Bundle For the given chiller, the inner tube diameter as well as water velocity at a specified flow rate were known. With this knowledge, the Reynolds number was found as a function of water flow rate.

42 Chiller 1. Manufacturer’s data The chiller components that were modeled include the compressor, evaporator and condenser. Manufacturer’s performance data was used to verify each model’s accuracy. For proprietary reasons, any reference to manufacturer or equipment has been excluded. Compressor Evaporator Tons % Load KW KW/Ton LWT GPM Condenser EWT Ref. Temp PD (ft) EWT GPM LWT Ref. 22 Table 7. Present Day Chiller Data The data used in this study is that of a modern, 1000 ton capacity, electrical chiller.

This figure clearly shows that at lower flow rates the curves approach each other, while they separate at the flow rate increases. The inner, water-side, heat transfer coefficient is a function of flow and fluid properties, namely the Reynolds and Prantl numbers. The outer, refrigerant side, heat transfer coefficient is a function of load, 49 or rate of boiling. In the evaporator refrigerant is boiling on the outside of tubes. At very small loads natural convection starts around the tube bundle.

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